Door latch and lock mechanism.



| n fi E. A. & C. C. GREWSON.

DOOR LATCH AND LOOK MECHANISM.

nrmounon rmnn JAH.18. 1010.

97837 5. Patenfied Dec.13,1910.

I Ligjgwvn To all whom it may concern:

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'EVANDEB A. CREWSON, 0F VEBSAILLES, A11!) OI IABLES C. CREWSON, OF KANSAS CITY,

' MISSOURI.

DOOR LATCH AND LOCK MECiELNISM.

Specification of Letters Patent.

Patented Dec. 13, 1910.

Application filed January 18; 1910. Serial No. 538,685.

Be it known that we, EVANDER SON and CHARLES'G. OREWSON, citizens of the United States, residing, respectively, at Versailles, in the county of Morgan, State of Missouri, and- Kansas City, in the county of Jackson and State of Missouri, have m- .vented certain new and useful Improvements in Door Latch and Look Mechanisms, of which the following is a specification.

Our invention. relates to latch and look mechanism, and our object is to produce a simple, cheap andefl'ective mechanism of the character named, which can be secured to the jamb of a door without necessitating .mortisin'g the same or interfering in any respect with the stile of the door, our special object being to produce an efficient and relif able mechanism of this character for use upon house do0rs,' car doors, refrigerator doors, furniture doors and gates.

With this general object in view and others as hereinafter appear, the invention 1 consists in certain novel and peculiar fea-l tures of construction and or anization as hereinafter described and claimed; and in order that it may be fully understood reference is to be had to the accompanying drawing, in which;

Figure 1, is a face view of a part of a j amb and the adjacent or free ed equipped respectively with a atch and a latch-tripping device. Fig. 2, is a plan view of the same. Fig. 3, is a vertical section taken on the dotted line III-III of Fig. 2. Fig. 4, is a face view of the jamb and door with the former equipped with a latch of modified form.

In the said drawing, 1 indicates a door and 2 the jamb adjacent to the free edge of the door, the latter beingshown as provided with a handle preferably in the form of a knob 3 and an escutcheon plate 4.

5 is a plate secured to the face of the jamb, preferably without mortising the same, said plate corresponding in thickness by preference, to the escutcheon plate 4. Pivoted at 6 to the plate 5 at a point above the horizontal plane of the door handle is a hookshaped latch 7, one side of the same being flat by preference, so as to fit squarely against plate 5, and the other side swelled ori'bowed as at 8 to provide a cam-face 9 whichslopes downwardly and inwardly door e of a door, 5

' toward the door. The latch is preferably A. Cnnwso proportioned and disposed that, through gravity, its free end or terminal will overla plate 4, of the door when closed and hold the latter in such position, and to limit the operative movement of the latch, plate 5 is provided with a stopin 10 to be engaged by the hollow or inside ace of the latch. If preferred, the pressure of a spring may be utilized to impart operative movement to the latch and resist inoperative or opposite movement thereof, the preferred type of construction being a coil spring 11 mounted upon a headed pm 12, and secured at one end in a hole 13 in plate 5, the other end engaging a groove 14 in the outer edge of the latch.

The latch is recessed in the edge of its pivoted end to rovide oppositely-disposed shoulders 15 an 16 for engagement at dif- 1 ferent times by a detent 17'pivotally mounted on pin 12, by preference, the detent being adapted by engagement with shoulder 15 to hold the latch in its operative position and thus guard against the door being opened accidentally or by a person at the outer side of the door. The detent when engaged with the shoulder 16 holds the latch in its inoper- 1 ative or unlatched position so as to leave the door free to be opened or closed from either side. In the construction shown, and especially that shown by Fig. 3, the operator at the inner side of the door is adapted as he grasps the handle or knob, to press with his thumb upon the beveled or cam-face t) and thus force the latch from the path of the door to permit the same to be opened, the latch swinging back to operative position so that as the door is closed, its free edge will strike said cam-end and cause the latch to yield and withdraw from the path of the door and then automatically resume its original position and hold the door closed.

This type of latch is designed more espe- I arm 19 projecting from the inner knob and limited in its range of movement by a pair gilt 15p either knob and turn itin the proper ction andthus,

- through the instrumentality of arm 19, press ath of the door and opened, the latch osition when oses the arm the latch out of the permit the same to swinging back to its or gmal unopposed. When the core will strikethe cam-face'9 of the latch. and

force the latter aside, the cam-face ofthe latch as; the same is returned-tooperative position under the pressureof the spring 11,

W11]. push arm 19 from theposition shown in dotted lines to the position shown. 1n full lines, Fig. 1, the knob turning with it, as

will be readily understood.

As a simple and inexpensive means of converting the latch of the type shown by F1gs. l and 2, into anight latch, the shank of the inner knob may be provided with a flattened side 22, and adjacent to said knob theescutcheon plate may be equip ed with a shdebar 23, so arranged that w on the door is closed, the bar may he slid longitudinally either by hand or through the instrumenta ity of a key, not shown, and thus cause it to fit against the flattened side of the knob shank to prevent the knob being turned and hence the door being unfastened, it being noticed by reference to Fi s. land 3, that the bar is provided with adongitudinal slot 24 engaging a pair of guide pins 25 projecting from the escutcheon plate and forming a guide and support for the bar andthe-said bar is also provlded with a pair of notches 26 and 27 for alternate engagement by a of advantage enumerated as spring 28 whereby the bar is held agalnst accidental movement after being disposed in its operative or inoperative position, the spring engaging the notch 26 when the bar 1s in inoperative position and the notch 27 when the bar is .engaging the flat side of the knob shank;

From the above description it will be apparent that we have produced a door latch and lock mechanism embodyin the features desirable and obviously susceptible of modification in minor particulars without departing from the spirit and scope or sacrificing any of the v advantages of the appended clalms.

- Having thus described the inventionwhat we claim as new and desire to secure by f LettersPat-ent, is:

1. The combination with a door jamb and a hinged door, of a plate secured to the door and pivotally suspended on said plate with jamb remote from the hinge edge of the door and provided with a stop, a latch of substantially hook-shape and fiat at one side its flat side against the latter and so hung that it presses against said sto with its free end or terminal projecting eyond the creme inner edges of said plate and "amb and overlapping the free edge oft e door when closed,the overlgpping end or terminal of the hook being ormed at 1ts 'slde remote from the said plate with a cam face which ress the latch until its free end is cleared y'the door; the latch also havin a shoulder, and a movable detent carri by said plate and adapted for engagement with said shoulder when the .latch is repressed, to

hold the latch in withdraw'n or inoperative position.

2. A pivotally suspended door latch of hook-shape, hav ng one side substantially flat andthe other bowed or swelled adjacent to the hook terminal to provide a cam-face; the plvotedend of the latch having a recess in its edge to provide a pair of oppositelydisposed shoulders, and a pivoted detent for engagement with either of said shoulders to lock the latch against swinging movement 1n one direction;

3, The combination with a door jamband a hinged. door, of a plate secured to the door jamb remote from the hinged edge of the door and provided with a stop, a latch of substantially hook-shape and flat at one side and pivotally suspended on said platewith its flat side against the latter and so hung that it presses against said stop, with its free end or terminal projectingbeyond the. inner edges of said plate and jamb and overlapping the free edge of the door'when closed, the overlapping end or terminal of the hook being formed at its side remote from the said plate with a cam face which slopes toward the doorway so that in closing, the free edge of the door shall strike said cam face and repress the latch until its free end is cleared by the door; said latch having a shoulder, and a movable detentlcarried by the plate andadapted forengagement with said shoulder to hold the latch in advanced or operative position to lock the door closed.

4;. The combination of a door and a door jamb, a knob carried by the door and capable of turning and provided with an arm, and a hook-shaped latch pivoted to the door jamb and adapted when the door is closed to overlap the same at its inner side and provided at its. side more remote from the jamb with a swelled or bowed portion forming a cam-face and having the edge of its free, end extending downwardly and in-- 5. The combination of a door and a door pable of turning and provided with an arm, and a hook-shaped latch pivoted to the door jamb and adapted when the door is closed to overlap the same at its inner side and provided at its side most remote from the jamb with a swelled or bowed portion forming a cam-face and having the ed e of its free end extending downwardly an inwardly with respect to the door opening and ada ted to be engaged by the arm of the knob when the latter is turned, and to engage said arm after the door is closed to return the said arm to its original position, and means engaging the latch, to prevent turning movement of the same and' of the door knob. 15

In testimony whereof we afiix our signatures, in the presence of two witnesses.

EVANDER A. CREWSON. CHARLES C. CREWSON.

\Vitnesses to signature of E. A. Crewson:

A. VETHERILL,

F. D. I'IARRISON. 

